A pair of tourmalines, 5.65 carats

Technical details: Type: Tourmaline Weight: 5.65 carats Dimensions (mm): 7.24x6.74x6.19 (average) Shape: Radiant Color: Bi-color + Pink Clarity: Eye-clean Transparency: Transparent Hardness: 7.0-7.5 Treatment: Untreated Origin: Unknown Certification: Certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Tourmaline is a complex group of borosilicate minerals, known for its wide range of colors that makes it one of the most colorful gemstones. It forms in hexagonal crystal systems and often exhibits pleochroism, where its color varies depending on the viewing angle. Tourmaline can be found in igneous and metamorphic rocks, and its different colors — such as pink, green, blue, and black — depend on its unique chemical composition and the presence of certain impurities.